Question

---Sorry, Professor Smith. I didn’t finish the assignment yesterday.
---Oh, you _____ have done it as yesterday was the deadline

1. A.
   must
2. B.
    mustn’t
3. C.
    should
4. D.
   shouldn’t

Answer 1

C
试题分析：考查should have done的固定句型，意思“本应该做某事，must have done表是对过去的一种虚拟，一定做某事；shouldn’t have done表示本不应该做事但是做了”， mustn’t表示禁止，句子意思“你本应该把它做完，但是你没有做完因为昨天是截止期限”，所以选C
考点：考查should have done的固定句型
点评：should have done的固定句型是常考内容，要知道它的意思，遇到此类题时，就很容易做出正确选择